src/patches/suse-2.6.27.31/patches.fixes/scsi-dh-alua-retry-UA

   1 From: Hannes Reinecke <hare@suse.de>
   2 Subject: Retry ALUA device handler initialization on Unit Attention
   3
   4 Whenever we receive a UNIT ATTENTION sense code we should just retry
   5 the command. We only should take care to pass through 04/02 as this
   6 is handled later on by the generic code in scsi_check_sense().
   7
   8 Signed-off-by: Hannes Reinecke <hare@suse.de>
   9
  10 diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
  11 index e356b43..a3660a6 100644
  12 --- a/drivers/scsi/device_handler/scsi_dh_alua.c
  13 +++ b/drivers/scsi/device_handler/scsi_dh_alua.c
  14 @@ -444,24 +444,16 @@ static int alua_check_sense(struct scsi_device *sdev,
  15                         return SUCCESS;
  16                 break;
  17         case UNIT_ATTENTION:
  18 -               if (sense_hdr->asc == 0x29 && sense_hdr->ascq == 0x00)
  19 -                       /*
  20 -                        * Power On, Reset, or Bus Device Reset, just retry.
  21 -                        */
  22 -                       return ADD_TO_MLQUEUE;
  23 -               if (sense_hdr->asc == 0x2a && sense_hdr->ascq == 0x06) {
  24 -                       /*
  25 -                        * ALUA state changed
  26 -                        */
  27 -                       return ADD_TO_MLQUEUE;
  28 -               }
  29 -               if (sense_hdr->asc == 0x2a && sense_hdr->ascq == 0x07) {
  30 -                       /*
  31 -                        * Implicit ALUA state transition failed
  32 -                        */
  33 -                       return ADD_TO_MLQUEUE;
  34 -               }
  35 -               break;
  36 +               if (sense_hdr->asc == 0x04 && sense_hdr->ascq == 0x02)
  37 +                       /*
  38 +                        * LUN not ready, initialization command required
  39 +                        */
  40 +                       return SCSI_RETURN_NOT_HANDLED;
  41 +
  42 +               /*
  43 +                * Just retry for UNIT_ATTENTION
  44 +                */
  45 +               return ADD_TO_MLQUEUE;
  46         }
  47
  48         return SCSI_RETURN_NOT_HANDLED;